/**
 * 
 */
package design_pattern.observer2;


/**
 * @author linzq
 *
 */
public class Client {

  public static void main(String[] args) {
    ConcreteSubject subject = new ConcreteSubject();
    Observer ob = new ConcreteObserver();
    subject.attach(ob);
    subject.change(22);
  }
}
